Reel rod for a printing cylinder



Dec. 27, 1938. I, TORNBERG v REEL ROD FOR A PRINTING CYLINDER Filed May18, 1936 2 Sheets-Sheet l lllllll i J Y n m A N l I ,v, u n P/ J Eu QM rI t Y Q mm illivillullilll Y Dec. 27, 1938.

I. TORNBERG Patented Dec. 27, 1938 UNITED STATES PATENT OFFICE 2,141,961REEL ROD FOR A PRINTING GYLINDER- Application May 18,

1 Claim.

. a very simple manner; to provide means whereby the blanket or drawsheet can be reeled in either direction; to provide a split reel rod,one part of which occupies most of the rod and is rotatably mounted inthe printing cylinder and the other part of which is detachablyconnected with the first; to provide yielding means for holding the twoparts together; to provide the two parts of the reel rod of unequalsegments held together by springs constituting substantially a completecircle, but cut to permit insertion of the end of the blanket or drawsheet; to provide the two segments of the reel rod on adjacent faceswith slanting surfaces to permit a tool to be inserted for spreadingthem apart to permit the insertion of the end of the blanket; to providemeans whereby the blanket, if wound in a skewed position, can berendered straight by moving one end of the reel rod in whateverdirection is required by means, preferably, of an eccentric adjustablebushing in one end of the rod.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings which show apreferred embodiment of this invention.

Fig. l is a side elevation of part of an impression cylinder of aprinting press with a preferred embodiment of this invention appliedthereto.

Fig, 2 is a sectional View on the line 2-2 of Fig. 1.

Fig, 3 is an end view of the operating mechanism.

Fig. 4 is a cross section of the two part reel rod showing it closed.

Fig. 5 is a similar View with the two parts pried open, and Figs. 6 and7 are details of the eccentric bushing.

The impression cylinder of a printing press is commonly covered withpacking in order that the printing may be made clear and distinct. Theusual type of packing or covering is applied by hanging one end of thecovering over pins or clamping means and reeling up the other end on areel rod. This invention relates mainly to that reel rod.

It is difficult to place the reeled up end of a blanket or draw sheetsquarely so that it will be drawn up with equal tightness on both edges;moreover, sometimes the blanket itself is not en- 1936, Serial No.80,295

tirely symmetrical and, in any case, it is difficult to attach theblanket or draw sheet to the reel rod in a sufiicien-tly square mannerto enable the sheet or blanket, when drawn firmly over the surfaces ofthe cylinder, to lie firmly at all points against the impressioncylinder. If it does not it will cause defects imprinting. Thisinvention is designed to overcome these difficulties in two particulars;the first is to provide a means for inserting the forward end of theblanket in a reasonably square and accurate position; the second is tochange the position of the end of the forward operating reel rod to takeout the skew of the blanket.

The printing cylinder i carries a reel rod 2 loosely mounted at one end,in a hole 3, the other end being mounted in a rotatable eccentricbushing i. The eccentric bushing 4 has a fiange on its lefthand end, asviewed in Fig. 1, and is mounted in an end plate 5 which latter issecured to this cylinder l by screws 6. A Worm wheel 3 is secured to thebushing 4 and, in cooperation with the flange mentioned above, holds thebushing 4 against end motion. The worm wheel 8 is secured to theeccentric bushing i and meshes with a worm 9 carried in a hole H! of thecylin der l and a poppet I l secured to the end plate 5. A collar I2 ispinned to the worm 9. As viewed in Fig. 3 a non-circular member [3 isprovided for rotating the worm 9.

It is apparent that, by rotation of this worm, the eccentric bushing 4may be rotated to throw the end of the reel rod 2 out of alignment withthe axis of the cylinder I. This action may be used tocorrect anylooseness in the draw sheet M which is wrapped around the reel rod 2.

A hub l5 of the poppet H is provided for the mounting of a pawl IS, awasher I1 and appropriate screw holding the pawl in place. The pawl i6cooperates with a ratchet wheel I8 carried on a non-circular member [9of the reel rod 2. A pin 20 serves to keep the ratchet wheel la in placeon the non-circular member.

An oppositely disposed pawl 2| mounted by a poppet 22 on the end plate 5is furnished to permit the draw sheet M to be operated in acounterclockwise direction as viewed in Fig. 3. When this action isdesired the pin 20 is removed and the ratchet l3 reversed so that itwill cooperate with the pawl 2|.

The reel rod 2 is of segmental shape to cooperate with a reel rodsegment 23 the two being held together by circular springs 24 out atpoints 25. The reel rod 2 and reel segment 23 are recessed at 39, asshown in Fig. 1, to accommodate the circular springs 24. A series ofthese springs is placed around the reel rod 2, and segment 23, in thisrecess in accordance with the amount of tension desired. oppositelyslanting surfaces 26 are provided on the adjacent surfaces of the reelrod 2 and reel. segment 23 so that a screw driver, or similar shapedtool, can be inserted for opening these parts according to Fig, .5,allowing a draw sheet or blanket to be entered therein. With the removalof the screw driver, the springs 24 clamp the blanket or draw sheetbetween the main reel rod 2 and the reel segment 23.

The other end of the draw sheet or blanket can be placed over blanketpins 21 or be held by tympan clamp fingers 28 carried on a tympan rod 29journaled in a hole 30 of the cylinder l and end plate 5. These tympanclamp fingers 28 are riveted to the tympan rod 29 by rivets 3|. An arm32 is secured to the end of the tympan rod 29 and has its free endbifurcated to accommodate an eye-bolt 33. One end of the eye-bolt ispivoted by a stud on the end plate 5, and the other end carries a halfround pin 35 cooperating with a complementary surface of the arm 32. Anut 36, in cooperation with the half round pin 35, can be used to forcethe arm 32 and tympan rod 29 in a clockwise direction as shown in Fig.3. This presses the tympan clamp fingers 28 against a surface 31 of thecylinder l to thereby clamp the draw sheet or blanket. Tympan clamp pins38 are provided, entering holes in the tympan clamping fingers 28, toassist in holding the draw sheet or blanket.

It is thus apparent that a new and useful device is provided for easilysecuringthe free end of a blanket or draw sheet to a reel rod and meansare provided for throwing the reel rod out of alignment with the axis ofthe printing cylinder to insure the draw sheet or blanket being heldfirmly against the surface of the impression cylinder.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claim, but what I claim is:

A reel rod formed of two segments, the adjacent surfaces of saidsegments at one side being slanted away from each other across the rodto form an opening for the insertion of a tool to permit them to beseparated, and a series of springs surrounding it and yieldingly holdingthe parts against separation,

ISIDOR TORNBERG.

